cyst

cyst

[sist]

1. bladder.

2. an abnormal closed epithelium-lined sac in the body that contains a liquid or semisolid substance. Most are harmless, but they should be removed when possible because they occasionally may change into malignant growths, become infected, or obstruct a gland. There are four main types of cysts: retention cysts, exudation cysts, embryonic cysts, and parasitic cysts.

3. a stage in the life cycle of certain parasites, during which they are enveloped in a protective wall.

alveolar c's dilatations of pulmonary alveoli, which may fuse by breakdown of their septa to form large air cysts (pneumatoceles).

arachnoid cyst a fluid-filled cyst between the layers of the leptomeninges, lined with arachnoid membrane, usually in the sylvian fissure.

Baker cyst a swelling on the back of the knee, due to escape of synovial fluid that has become enclosed in a sac of membrane.

Bartholin cyst a mucus-filled cyst of a Bartholin gland, usually developing as a consequence of an obstruction of the duct by trauma, infection, epithelial hyperplasia, or congenital atresia or narrowing.

bronchogenic cyst a congenital cyst, usually in the mediastinum or lung, arising from anomalous budding during formation of the tracheobronchial tree, lined with bronchial epithelium that may contain secretory elements.

chocolate cyst one filled with hemosiderin, causing a dark color, following local hemorrhage, such as may occur in the ovary in ovarian endometriosis.

choledochal cyst a congenital cystic dilatation of the common bile duct, which may cause pain in the right upper quadrant, jaundice, fever, or vomiting, or be asymptomatic.

daughter cyst a small parasitic cyst developed from the walls of a larger cyst.

dentigerous cyst an odontogenic cyst surrounding the crown of a tooth, originating after the crown is completely formed.

duplication cyst a congenital cystic malformation of the alimentary tract, consisting of a duplication of the segment to which it is adjacent, occurring anywhere from the mouth to the anus but most frequently affecting the ileum and esophagus.

follicular cyst one due to occlusion of the duct of a follicle or small gland, especially one formed by enlargement of a graafian follicle as a result of accumulated transudate.

hydatid cyst the larval stage of the tapeworms Echinococcus granulosis and E. multilocularis; each one contains daughter cysts that have many scoleces (mouths). See also hydatid disease. Called also echinococcus cyst and hydatid.

inclusion cyst one formed by the inclusion of a small portion of epithelium or mesothelium within connective tissue along a line of fusion of embryonic processes; several types are found in the oral and nasal regions.

keratinizing cyst one arising in the pilosebaceous apparatus, lined by stratified squamous epithelium and containing largely macerated keratin and often sufficient sebum to render the contents greasy or rancid.

2. a hydatid cyst with many small irregular cavities that may contain scoleces but generally little fluid.

3. a thick-walled cyst in the kidney, found in clusters and usually unilaterally. In children it contains blastema and may develop into a Wilms tumor.

myxoid cyst a nodular lesion usually overlying a distal interphalangeal finger joint in the dorsolateral or dorsomesial position, consisting of focal mucinous degeneration of the collagen of the dermis; not a true cyst, lacking an epithelial wall, it does not communicate with the underlying synovial space.

Naboth's c's (nabothian c's) cysts that occur when mucus-producing glands in the columnar epithelium of the uterine cervix become covered over by squamous epithelium resulting from metaplasia; they are usually found in the transformation zone of the cervix. Called also Naboth's or nabothian follicles.

nasoalveolar cyst (nasolabial cyst) a fissural cyst arising outside the bones at the junction of the globular portion of the medial nasal process, lateral nasal process, and maxillary process.

odontogenic cyst one derived from epithelium, usually containing fluid or semisolid material, which develops during various stages of odontogenesis; nearly always enclosed within bone.

parasitic cyst one forming around larval parasites (tapeworms, amebas, trichinae), such as a hydatid cyst.

perineurial cyst an outpouching of the perineurial space on the extradural portion of the posterior sacral or coccygeal nerve roots at the junction of the root and ganglion; it may cause low back pain and sciatica.

periodontal cyst one in the periodontal ligament and adjacent structures, usually at the apex of the tooth (periapical cyst).

pilar cyst a type of epidermal cyst, almost always found on the scalp, arising from the outer root sheath of the hair follicle.

Rathke's c's (Rathke's cleft c's) groups of epithelial cells forming small colloid-filled cysts in the pars intermedia of the pituitary gland; they are vestiges of Rathke's pouch and are closely related to craniopharyngiomas.

retention cyst a tumorlike accumulation of a secretion formed when the outlet of a secreting gland is obstructed. These cysts may develop in any of the secretory glands, such as the breast, pancreas, kidney, salivary or sebaceous glands, or mucous membranes.

solitary bone cyst a pathologic bone space in the metaphyses of long bones of growing children; it may be either empty or filled with fluid and have a delicate connective tissue lining.

subchondral cyst a bone cyst within the fused epiphysis beneath the articular plate.

tarry cyst

1. one resulting from hemorrhage into a corpus luteum.

2. a bloody cyst resulting from endometriosis.

theca-lutein cyst a cyst of the ovary in which the cystic cavity is lined with theca cells.

traumatic bone cyst a cavity (not a true cyst) formed in bone, particularly the mandible, in response to trauma. The hematoma precipitated by trauma is resorbed but bone is not replaced; the space formed is usually empty and lacks an epithelial lining.

bronchogenic cyst a congenital cyst, usually in the mediastinum or lung, arising from anomalous budding during formation of the tracheobronchial tree, lined with bronchial epithelium that may contain secretory elements.

chocolate cyst one having dark, syrupy contents, resulting from collection of hemosiderin following local hemorrhage.

choledochal cyst a congenital cystic dilatation of the common bile duct, which may cause pain in the right upper quadrant, jaundice, fever, or vomiting, or be asymptomatic.

congenital preauricular cyst one due to imperfect fusion of the first and second branchial arches in formation of the auricle, communicating with an ear pit on the surface.

dentigerous cyst a fluid-containing odontogenic cyst surrounding the crown of an unerupted tooth.

dermoid cyst a teratoma, usually benign, characterized by mature ectodermal elements, having a fibrous wall lined with stratified epithelium, and containing keratinous material, hair, and sometimes material such as bone, tooth, or nerve tissue; found most often in the ovary.

duplication cyst a congenital cystic malformation of the alimentary tract, consisting of a duplication of the segment to which it is adjacent, occurring anywhere from the mouth to the anus but most frequently affecting the ileum and esophagus.

enteric cyst , enterogenous cyst a cyst of the intestine arising or developing from a fold or pouch along the intestinal tract.

epidermal cyst a benign cyst derived from the epidermis or the epithelium of a hair follicle; it is formed by cystic enclosures of epithelium within the dermis, filled with keratin and lipid-rich debris.

epidermal inclusion cyst a type of epidermal cyst occurring on the head, neck, or trunk, formed by keratinizing squamous epithelium with a granular layer.

follicular cyst one due to occlusion of the duct of a follicle or small gland, especially one formed by enlargement of a graafian follicle as a result of accumulated transudate.

globulomaxillary cyst one within the maxilla at the junction of the globular portion of the medial nasal process and the maxillary process.

hydatid cyst the larval cyst stage of the tapeworms Echinococcus granulosus and E. multilocularis, containing daughter cysts with many scoleces.

keratinizing cyst one arising in the pilosebaceous apparatus, lined by stratified squamous epithelium and containing largely macerated keratin and often sufficient sebum to render the contents greasy or rancid.

2. a hydatid cyst with many small irregular cavities that may contain scoleces but generally little fluid.

3. a thick-walled cyst in the kidney, found in clusters and usually unilaterally. In children it contains blastema and may develop into a Wilms tumor.

myxoid cyst a nodular lesion usually overlying an interphalangeal finger joint, consisting of focal mucinous degeneration of collagen of the dermis; not a true cyst, it lacks an epithelial wall and does not communicate with the underlying synovial space.

Rathke's cysts , Rathke's cleft cysts groups of epithelial cells forming small colloid-filled cysts in the pars intermedia of the pituitary gland; they are vestiges of Rathke's pouch and are closely related to craniopharyngiomas.

retention cyst one caused by blockage of the excretory duct of a gland, so that glandular secretions are retained.

cyst

1. An abnormal sac containing gas, fluid, or a semisolid material, with a membranous lining. See also: pseudocyst

2. Larval stage of some cestodes.

[G. kystis, bladder]

cyst

(sist) [Gr. kystis, bladder, sac]

1. A closed sac or pouch with a definite wall, containing fluid, semifluid, or solid material. It is usually an abnormal structure resulting from developmental anomalies, obstruction of ducts, or parasitic infection.

2. In biology, a structure formed by and enclosing certain organisms in which they become inactive, such as the cyst of certain protozoans or of the metacercariae of flukes.

adventitious cyst

A cyst formed around a foreign body.

alveolar cyst

Dilation and rupture of pulmonary alveoli to form air cysts.

apical cyst

A cyst near the apex of the root of a nonvital tooth.

arachnoid cyst

An abnormal collection of cerebrospinal fluid within the arachnoid membrane. The cysts may compress nearby structures within the brain. In infants, they may cause headaches, altered mental status, learning disabilities, or enlargement of the head. In adults, they are an occasional cause of epilepsy.

Boyer cyst

cervical cyst

chocolate cyst

An ovarian cyst with darkly pigmented gelatinous contents.

colloid cyst

A cyst with gelatinous contents.

complex cyst

A cyst that consists of solid material and fluid-filled cavities; it may have walls of tissue inside it or internal echoes. When a complex cyst is identified on ultrasound, surgical removal is generally indicated to exclude malignancy.

congenital cyst

A cyst present at birth and resulting from abnormal development, such as a dermoid cyst, imperfect closure of a structure as in spina bifida cystica, or nonclosure of embryonic clefts, ducts, or tubules, such as cervical cysts.

daughter cyst

A cyst growing out of the walls of another cyst.

dental cyst

A cyst that forms from any of the odontogenic tissues.

dentigerous cyst

A fluid-filled, epithelial-lined cyst usually surrounding the crown of a tooth that is erupting or has not yet erupted. The tooth normally erupts through the cyst without treatment. Synonym: eruption cyst; follicular cyst; follicular odontoma

dermoid cyst

1. An ovarian teratoma.

2. A nonmalignant cystic tumor containing elements derived from the ectoderm, such as hair, teeth, or skin. These tumors occur frequently in the ovary but may develop in other organs such as the lungs.

distention cyst

A cyst formed in a natural enclosed cavity, such as a follicular cyst of the ovary.

ganglion cyst

Gartner cyst

Gorlin cyst

hydatid cyst

A cyst formed by the growth of the larval form of Echinococcus granulosus, usually in the liver. Synonym: echinococcus cyst

implantation cyst

A cyst resulting from displacement of portions of the epidermis, as may occur in injuries.

intraligamentary cyst

A cystic formation between the layers of the broad ligament.

involutional cyst

A cyst occurring in the normal involution of an organ or structure, as in the mammary gland.

keratin cyst

A cyst containing keratin.

cysts of liver

Simple cysts, usually small and single; or hydatid cysts; or cysts associated with cystic disease of the liver, a rare condition usually associated with congenital cystic kidneys. See: Echinococcus granulosus; hydatid

meibomian cyst

meniscus cyst

A fluid-filled cyst often associated with a degenerative horizontal meniscal tear, more frequently seen in the lateral meniscus of the knee. This ganglion-like cyst may present with a palpable mass at the joint line of the knee and can be visualized by magnetic resonance imaging.

morgagnian cyst

Morgagni cyst

mother cyst

mucous cyst

nabothian cyst

A cyst caused by closure of the ducts of the nabothian glands in the uterine cervix as a result of chronic cervicitis.

odontogenic cyst

A cyst associated with the teeth, such as a dentigerous or radicular cyst.

ovarian cyst

A fluid-filled cyst that develops in the ovary and consists of one or more chambers. The main types of cysts are follicular cysts, the corpus luteum, teratoma, and endometrioma. The patient's primary complaint is generally pelvic pain or pain during intercourse. The cysts may be palpated during bimanual examination but are diagnosed by ultrasound. Many cysts resolve spontaneously. Although nonmalignant, the cyst may have to be removed surgically because of twisting of the pedicle, which causes gangrene, or because of pressure.

parovarian cyst

periapical cyst

pilar cyst

An epithelial cyst with a wall that resembles the follicular epithelium. It is filled with a homogeneous mixture of keratin and lipid.

Synonym: trichilemma cyst

pilonidal cyst

A cyst most often in the sacrococcygeal region, usually at the upper end of the intergluteal cleft. It is due to a developmental defect that permits epithelial tissue to be trapped below the skin or may be acquired. This type of cyst may become symptomatic in early adulthood when an infected draining sinus forms.

trichilemma cyst

tubo-ovarian cyst

An ovarian cyst that ruptures into the lumen of an adherent uterine tube.

unilocular cyst

A cyst containing only one cavity.

vaginal cyst

A cyst in the vagina.

vitelline cyst

A congenital cyst of the gastrointestinal canal. Lined with ciliated epithelium, it is the remains of the omphalomesenteric duct.

wolffian cyst

A cyst lying in one of the broad ligaments of the uterus.

illustration

cyst

An abnormal, usually spherical, walled cavity filled with secreted fluid or semi-solid matter derived from the cyst itself. Most cysts are benign but a few are malignant. Retention cysts may form when the outlet of normal glands become blocked. Sebaceous cysts and eyelid MEIBOMIAN CYSTS are of this type.

cyst

a bladder or bag-like structure that may contain the resting stage of an organism. Many groups or organisms have encysted stages, e.g. protozoans, nematodes, flukes, tapeworms.

a MORBID structure arising as an outgrowth of the skin, such as a sebaceous cyst, usually arising from a blocked duct, or an internal growth, for example, an ovarian cyst.

Cyst

A protective sac that includes either fluid or the cell of an organism. The cyst enables many organisms to survive in the environment for long periods of time without need for food or water.

cyst

An abnormal sac containing gas, fluid, or a semisolid material, with a membranous lining.

[G. kystis, bladder]

cyst (sist),

n a pathologic space in bone or soft tissue containing fluid or semifluid material and, in the oral regions, almost always lined by epithelium.

cyst, aneurysmal bone

n a nonmalignant osteolytic lesion expanding a long bone or within a vertebra in which the space, filled with blood, is networked with fibrous tissue containing multinucleated giant cells.

cyst, apical periodontal,

n See cyst, periapical.

cyst, branchial,

n (branchial cleft cyst), a soft-tissue cyst usually seen on the lateral side of the neck, arising from epithelial illusions within the cervical lymph nodes. Microscopic examination shows the epithelial lining of stratified squamous epithelium surrounded by lymphoid tissue.

Branchial cyst.

cyst, calcifying odontogenic (Gorlin cyst),

n a cyst arising from odontogenic epithelium, with abundant production of keratin-containing ghost cells and areas of dystrophic calcification. This lesion has a predilection for young adults.

cyst, dental,

n See cyst, periodontal.

n See cyst, eruption.

cyst, dentigerous

n an epithelium-lined sac filled with fluid or semifluid material that surrounds the crown of an unerupted tooth or odontoma.

cyst, dentoalveolar,

n See cyst, periodontal.

cyst, dermoid

n an epithelium-lined sac with one or more skin appendages (hair follicles, sweat glands, sebaceous glands) in its wall. It may be found in the floor of the oral cavity. This lesion should not be confused with the teratomatous dermoid cyst of the ovary.

Dentigerous cyst.

cyst, developmental,

n a pathologic fluid sac that may be caused by infection or disease. See also cyst, dentigerous and cyst, odontogenic.

cyst, epidermoid

n a fluid-filled, epithelium-lined sac thought to arise from hair follicles of the skin.

cyst, eruption,

n a dentigerous cyst that causes a clinically evident bulging of the overlying alveolar ridge.

cyst, extravasation,

n See cyst, traumatic.

cyst, fissural,

n a cyst that arises from the enslaved epithelium in maxillary suture lines caused by fusion of the embryonic processes of the facial bones.

cyst, follicular

n See cyst, dentigerous.

cyst, gingival, of the adult,

n a rare gingival cyst, usually painless, that originates on dental laminar rests. It is usually categorized as an extra-osseous instance of a lateral periodontal cyst.

cyst, gingival, of the newborn,

n a keratin-filled benign cyst on the alveolar mucosa that is common among newborn infants. Similar to palatal cysts of the newborn.

cyst, globulomaxillary

n thought to have been a developmental fissural cyst arising in the area between the nasal process and maxillary process. It is now believed that all these lesions are actually other odontogenic cysts, such as odontogenic keratocysts or lateral periodontal cysts.

cyst, Gorlin,

n See cyst, calcifying odontogenic (Gorlin cyst).

cyst, hemorrhagic

n an extravasation cyst or lesion; traumatic bone cyst or lesion. This is not a true cyst but is probably a defect in the bone produced by trauma and repair. It appears as a definite radiolucent area with a sharply marked radiopaque border. It contains air and is lined by a thin endosteum. See also cyst, solitary bone.

cyst, incisive canal,

n See cyst, nasopalatine.

cyst, indefinite bone,

n See cyst, traumatic.

cyst, lateral,

n See cyst, periodontal.

cyst, lateral periodontal (botryoid odontogenic cyst),

n a noninflammatory cyst found in the tooth-generating tissue on the lateral surface of the root of a tooth.

cyst, median palatal,

n an epithelium-lined sac containing fluid; appears as a radiolucency in the midline of the palate. It is of developmental origin.

cyst, multilocular

n a follicular cyst containing many loculi, or spaces, and not associated with a tooth.

cyst, nasoalveolar

n a fluid-containing sac lined by epithelium and located at the ala of the nose. A developmental cyst, it may simulate a nasal or periapical abscess.

n a cyst arising within the nasopalatine canal. Radiographically it may appear as a heart-shaped radiolucency between the maxillary central incisors. Histologically it may show mucous cells and nerve bundles in addition to a lining of stratified squamous or respiratory epithelium. The incisive canal cyst and the cyst of the papilla incisiva are the recognized subtypes.

cyst, nonodontogenic,

n a soft tissue abnormality that may develop in any number of locations within the oral cavity but is not directly associated with a tooth.

cyst, odontogenic,

n an epithelium-lined sac produced from the tooth-forming tissues (e.g., primordial, dentigerous, and periodontal cysts).

cyst, palatal, of the newborn,

n a common developmental cyst found on the hard palates of most infants. It is small, white, and filled with keratin. Called Epstein's pearls when found on the midline of the palate, and Bohn's nodules when found elsewhere on the palate, though both types are the same.

cyst, periapical,

n a cyst that has a fibrous connective tissue wall and a lining of stratified squamous epithelium and that is attached to the apex of the root of a tooth with a nonvital pulp or a defective root canal filling.

n an epithelium-lined sac containing fluid usually found at the apex of a pulp-involved tooth. Lateral types occur less frequently along the side of the root.

cyst, primordial

n an epithelium-lined sac containing fluid and appearing as a radiolucency in the jaws. It is derived from an enamel organ before any hard tissue is formed.

n See cyst, periapical.

cyst, residual,

n an odontogenic cyst that remains within the jaw after the removal of the tooth with which it was associated. May be radicular or follicular.

cyst, root end,

n See cyst, periapical.

cyst, simple bone,

n a diseased bone cavity that forms around the roots of teeth, easily identifiable during radiologic exam. Of uncertain origin. Previously known as traumatic bone cyst and solitary bone cyst.

cyst, soft tissue,

n a broad classification of oral abnormalities that may include blisterlike obstructions of salivary glands and growths in the thyroglossal tract, lymph nodes, and epithelial cells on the floor of the oral cavity.

cyst, soft tissue developmental,

n a pathologic fluid sac that occurs in mucous membranes or other soft tissue of the body, as opposed to those occurring in bone or teeth. See also cyst, thyroglossal duct and cyst, lateral cervical.

cyst, solitary bone,

n See cyst, simple bone.

n an epithelium-lined sac containing fluid formed in portions of the incompletely involuted thyroglossal duct, which connects the primitive pharynx with the tongue in embryonic life. These cysts may appear in the midline at any region from the subhyoid to the base of the tongue.

cyst, traumatic bone,

n See cyst, simple bone.

cyst

1. a closed epithelium-lined sac or capsule containing a liquid or semi-solid substance. Most cysts are harmless but they occasionally may change into malignant growths, become infected, or obstruct a gland. There are four main types of cysts: retention cysts, exudation cysts, embryonic cysts and parasitic cysts. See also specific locations and organs.

2. a stage in the life cycle of certain parasites, during which they are enveloped in a protective wall. See also cystic.

one forming around larval parasites (tapeworms, amebae, trichinae) that enter the body.

pseudohorn cyst

invagination of hyperplastic epidermis; not a true cyst.

retention cyst

a tumor-like accumulation of a secretion formed when the outlet of a secreting gland is obstructed. These cysts may develop in any of the secretory glands—the mammae, pancreas, kidney, salivary or sebaceous glands, and mucous membranes. See also renal retention cysts.

sarcosporidian c's

cylindrical cysts (schizonts) containing bradyzoites, found in the muscles of those infected with Sarcocystis spp.

an acquired or congenital structure which may arise from the iris or the ciliary body. Visible as a mass attached to the iris or may be floating freely in the anterior chamber. Those arising from the ciliary body may not be visible. Seen most commonly in horses. See also iris cyst.

vitelline cyst

a congenital cyst lined with ciliated epithelium occurring along the gastrointestinal canal; the remains of the omphalomesenteric duct.

Patient discussion about cyst

Q. What is ovarian cyst and why is it painful? Is that pathological? Dangerous? Need information please.

A. don’t worry- ovarian cyst is usually a natural thin. It shouldn’t be of a problem. And if you need to hear it from a gynecologist:http://www.5min.com/Video/Menstrual-Pains-and-Cysts-2374793

Q. What is the treatment for an arachnoid cyst? My 15 year old son has just been diagnosed with an arachnoid cyst. What is the treatment? Is an operation necessary?

A. An operation is not always necessary, it depends on the size and location of the cyst. I suggest you take your son to a neurologist or a neurosurgeon for further consult.

Q. What is pilonidal cyst?

A. very true, here is another site that may help you too:http://www.mayoclinic.com/print/pilonidal-cyst/DS00747/DSECTION=all&METHOD=print

All content on this website, including dictionary, thesaurus, literature, geography, and other reference data is for informational purposes only. This information should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional.